AC•THOR
®
/ AC•THOR
®
9s Operating instructions, version a0020806
14
TIP: If not all three outputs of a three-phase heating element are used for boosting,
control power is still available in case of excess energy!
Optionally, three temperature sensors can also be used in the operation of three single-phase
heating elements. The assignment must be made vice versa to the load outputs.
Note: One temperature sensor is always enclosed with the
AC•THOR
, other sensors must be
purchased separately.
Load output / heater Sensor number
Out-3 / Top
1
Out-2 / Center
2
Out-1 / Bottom
3
Excess power control and boost backup are then carried out individually for each heating element;
the settings in " Hot water 1 temperatures" affect all three elements. If only one sensor is used, this
only switches off the upper heating element, the other heating elements must be controlled via
thermostats.
AC•THOR: Hot water with
two single-phase immersion heaters
AC•THOR 9s: Hot water with
two three-phase immersion heaters
In a water tank in this operating mode, two immersion heating elements are supplied successively
and linearly with excess PV power. The upper element has priority. The aim is to reach the desired
temperature at the tapping point as quickly as possible before further excess power heats up the
remaining contents of the tank.
As soon as the upper immersion heating element reaches the target temperature the lower heater
will be supplied. If no my-PV temperature sensor is used, the switch-over takes place via the
thermostats of the heating elements, the AC
•
THOR then regularly checks whether the upper heating
element is available again. If the my-PV temperature sensor is used, the changeover takes place
when the temperature at the sensor reaches the set maximum value.
Both heating elements must be equipped with a bimetal thermostat to switch off when the set
temperature is reached!
With AC
•
THOR, the switchover between the single-phase heating elements takes place directly via
the integrated relay (see wiring diagram). With the
AC•THOR
9s, the relay operates a three-pole NC
contact and a three-pole NO contact (see wiring diagram), which then switch over the three-phase
heating elements.
TIP: It is also possible to control two immersion heating element s in separate tanks.
The "upper" heater would then for instance be located in a drinking water tank, the
"lower" heater in a buffer tank alongside it.
O
ptionally, the AC•THOR can also take over the boost backup of the hot water temperature at the
upper immersion heater. For this, the my-PV temperature sensor is to be used.
The my-PV temperature sensor must in any event be installed in the hot water tank above the
upper heater to provide a reliable reading!
